What it helps you decide
Estimate NaOH or KOH from transparent oil SAP values.
Free formulation estimate
Make the lye math transparent before you make soap.
Use common oil presets or enter supplier SAP values, then calculate NaOH or KOH, superfat, water, and an approximate formula profile.
Excel-readyExport this tool as a downloadable .xlsx spreadsheet.
Start with the example
The values already filled in are a working example—not a recommendation.
- 1Choose the closest starting point.
- 2Replace the example with your real details.
- 3Read the live result and its important limits.
Oil formula
Enter oils by weight
OilWeight gNaOH SAP
Caustic-chemical safety
SAP values vary by oil lot and source. Verify every value with your supplier and a second trusted calculator. Wear appropriate PPE; add lye to water—never water to lye—and follow a tested process.
About this free formulation & batching tool
How to use the Soap Lye & Superfat Calculator
Estimate NaOH or KOH from transparent oil SAP values. The calculator runs privately in your browser and is designed to make the assumptions behind the answer visible.
What to have ready
Start with a tested baseline formula, measured weights, the unit used by the full batch, and your actual finished yield or process loss.
How to use the result
Treat the output as a controlled batch draft. Record the assumptions, run a small test, and approve the result only after checking quality and safety.
Excel spreadsheet export
Download the Soap Lye & Superfat Excel Spreadsheet
Use the Soap Lye & Superfat Calculator in your browser, then export a branded .xlsx formula workbook to preserve the formula inputs, batch quantities, and calculated result for the next production run.
This gives you a portable formula workbook you can save with an order, production record, planning meeting, or pricing review. The workbook keeps the source link and date with the numbers, making it easier to understand where the result came from when you reopen or share it later.
Spreadsheet questions
Using this tool as an Excel workbook
Use the browser calculator for speed, then take the result into the spreadsheet workflow that fits your business.
Can I export the Soap Lye & Superfat Calculator to Excel?
Yes. Enter your information, review the live result, and select Export to Excel. Batch Scale creates a branded .xlsx workbook with your inputs and the result shown by the tool.
What is included in the Soap Lye & Superfat Excel Spreadsheet?
The workbook includes a Tool Result sheet, an Inputs sheet, the original calculator link, and the date generated. When a supported calculator has an Excel formula profile, its result cells remain connected to the editable input cells.
Can I use the spreadsheet in Google Sheets?
You can import the .xlsx workbook into Google Sheets. Because spreadsheet applications sometimes interpret formulas and formatting differently, confirm any important result after importing—especially before using it for pricing, safety, compliance, or production.
Is the Excel download free?
Yes. The calculator and workbook are free. The first Excel export on a device asks for your email and permission to receive occasional practical Batch Scale resources. Once captured, later tool exports on that device download directly.
Complete workflow guide
Candle, soap, and cosmetic formulation
A calculator can check the math. A reliable product also needs clear supplier information, a repeatable process, testing in the final package, and the right label for what the product is and what you claim it does.
Ready for the connected version?
Turn the calculation into a repeatable workflow.
Batch Scale connects recipes, materials, costs, inventory, production, sales, and your storefront in one workspace.